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Adaptive amplifying digital baseband pre-distortion method

A digital baseband and pre-distortion technology, applied in the baseband system parts, synchronization/start-stop system, etc., can solve the problems of large calculation and storage capacity, limited practical application, etc., and achieve real-time update, fast convergence speed, and robustness strong effect

Active Publication Date: 2012-06-06
北京中科微投资管理有限责任公司
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Problems solved by technology

However, these methods increase a large amount of computation and storage compared to traditional algorithms based on the LMS criterion (or RLS criterion), thus limiting their practical applications to a large extent

Method used

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  • Adaptive amplifying digital baseband pre-distortion method
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Embodiment Construction

[0036] refer to figure 1 , a structural diagram of an adaptive power amplifier digital baseband pre-distortion system, wherein the essence of the system is to connect a pre-distortion module in series in front of the power amplifier, and the pre-distortion module at least includes a pre-distortion module and a pre-distortion training module. The structure is exactly the same, and the actual predistortion module is to copy the parameters of the predistortion training module and apply it to the predistortion module in series. The comparison module is used to calculate the residual e(n) according to the coefficient vector w(n), the input sequence x(n) and the output sequence z(n); and output the residual e(n) to the preset Distort the training module so that the coefficient vector is updated to obtain w(n+1).

[0037] The predistortion adopts a polynomial structure with memory, and the relationship between the input signal and the output signal is as follows:

[0038] ...

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Abstract

The invention relates to an adaptive amplifying digital baseband pre-distortion method. The method comprises the following detailed steps of: step A, judging whether an input signal and an output signal of a pre-distortion system are equal or not, if so, disconnecting with a pre-distortion training module, otherwise, performing step B; and step B, using a training method of a memory multinomial coefficient of Kalman filter to set the to-be-estimated memory multinomial coefficient of the pre-distortion training module to be a state variable, establishing a state space model, and using an estimation value of the prior time and a sampling value of the present time to update the state variable to acquire the estimation value of the present time. Compared with the traditional pre-distortion scheme, the technical scheme provided by the invention has the advantages of high robustness and convergence rate; and the requirement of updating parameters in real time can be met through the technical scheme.

Description

technical field [0001] The invention relates to the field of digital baseband signal processing, in particular to an adaptive power amplifier digital baseband predistortion method. Background technique [0002] A power amplifier (referred to as a power amplifier) ​​is the most important device in a communication system, and there is inherent nonlinearity between its input and output, which causes signal distortion. Some new modulation techniques (such as 16QAM, OFDM, etc.) are often used in modern communication standards to improve spectrum utilization. However, these modulation techniques are very sensitive to PA nonlinearities. Nonlinearities cause spectral regrowth, or expansion, outside the signal bandwidth, causing interference to adjacent channels. At the same time, this non-linearity also causes distortion within the signal bandwidth, thereby deteriorating the bit error rate of the system. In addition, signals with a high peak-to-average power ratio are particularl...

Claims

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Application Information

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IPC IPC(8): H04L25/49H04L25/02
Inventor 张浩阎跃鹏陈立平
Owner 北京中科微投资管理有限责任公司
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